import hashlib
import os
import socket
import sys
import base64
import time
from django.db.models import F, Q
from xos.config import Config
from synchronizers.base.syncstep import SyncStep
from synchronizers.base.ansible import run_template_ssh
from synchronizers.base.SyncInstanceUsingAnsible import SyncInstanceUsingAnsible
from core.models import Service, Slice, Tag
from services.cord.models import VSGService, VSGTenant, VOLTTenant
from services.hpc.models import HpcService, CDNPrefix
from xos.logger import Logger, logging

# hpclibrary will be in steps/..
parentdir = os.path.join(os.path.dirname(__file__),"..")
sys.path.insert(0,parentdir)

from broadbandshield import BBS

logger = Logger(level=logging.INFO)

ENABLE_QUICK_UPDATE=False

CORD_USE_VTN = getattr(Config(), "networking_use_vtn", False)

class SyncVSGTenant(SyncInstanceUsingAnsible):
    provides=[VSGTenant]
    observes=VSGTenant
    requested_interval=0
    template_name = "sync_vcpetenant.yaml"
    service_key_name = "/opt/xos/synchronizers/vcpe/vcpe_private_key"

    def __init__(self, *args, **kwargs):
        super(SyncVSGTenant, self).__init__(*args, **kwargs)

    def fetch_pending(self, deleted):
        if (not deleted):
            objs = VSGTenant.get_tenant_objects().filter(Q(enacted__lt=F('updated')) | Q(enacted=None),Q(lazy_blocked=False))
        else:
            objs = VSGTenant.get_deleted_tenant_objects()

        return objs

    def get_vcpe_service(self, o):
        if not o.provider_service:
            return None

        vcpes = VSGService.get_service_objects().filter(id=o.provider_service.id)
        if not vcpes:
            return None

        return vcpes[0]

    def get_extra_attributes(self, o):
        # This is a place to include extra attributes that aren't part of the
        # object itself. In the case of vCPE, we need to know:
        #   1) the addresses of dnsdemux, to setup dnsmasq in the vCPE
        #   2) CDN prefixes, so we know what URLs to send to dnsdemux
        #   3) BroadBandShield server addresses, for parental filtering
        #   4) vlan_ids, for setting up networking in the vCPE VM

        vcpe_service = self.get_vcpe_service(o)

        dnsdemux_ip = None
        cdn_prefixes = []

        cdn_config_fn = "/opt/xos/synchronizers/vcpe/cdn_config"
        if os.path.exists(cdn_config_fn):
            # manual CDN configuration
            #   the first line is the address of dnsredir
            #   the remaining lines are domain names, one per line
            lines = file(cdn_config_fn).readlines()
            if len(lines)>=2:
                dnsdemux_ip = lines[0].strip()
                cdn_prefixes = [x.strip() for x in lines[1:] if x.strip()]
        else:
            # automatic CDN configuiration
            #    it learns everything from CDN objects in XOS
            #    not tested on pod.
            if vcpe_service.backend_network_label:
                # Connect to dnsdemux using the network specified by
                #     vcpe_service.backend_network_label
                for service in HpcService.objects.all():
                    for slice in service.slices.all():
                        if "dnsdemux" in slice.name:
                            for instance in slice.instances.all():
                                for ns in instance.ports.all():
                                    if ns.ip and ns.network.labels and (vcpe_service.backend_network_label in ns.network.labels):
                                        dnsdemux_ip = ns.ip
                if not dnsdemux_ip:
                    logger.info("failed to find a dnsdemux on network %s" % vcpe_service.backend_network_label)
            else:
                # Connect to dnsdemux using the instance's public address
                for service in HpcService.objects.all():
                    for slice in service.slices.all():
                        if "dnsdemux" in slice.name:
                            for instance in slice.instances.all():
                                if dnsdemux_ip=="none":
                                    try:
                                        dnsdemux_ip = socket.gethostbyname(instance.node.name)
                                    except:
                                        pass
                if not dnsdemux_ip:
                    logger.info("failed to find a dnsdemux with a public address")

            for prefix in CDNPrefix.objects.all():
                cdn_prefixes.append(prefix.prefix)

        dnsdemux_ip = dnsdemux_ip or "none"

        # Broadbandshield can either be set up internally, using vcpe_service.bbs_slice,
        # or it can be setup externally using vcpe_service.bbs_server.

        bbs_addrs = []
        if vcpe_service.bbs_slice:
            if vcpe_service.backend_network_label:
                for bbs_instance in vcpe_service.bbs_slice.instances.all():
                    for ns in bbs_instance.ports.all():
                        if ns.ip and ns.network.labels and (vcpe_service.backend_network_label in ns.network.labels):
                            bbs_addrs.append(ns.ip)
            else:
                logger.info("unsupported configuration -- bbs_slice is set, but backend_network_label is not")
            if not bbs_addrs:
                logger.info("failed to find any usable addresses on bbs_slice")
        elif vcpe_service.bbs_server:
            bbs_addrs.append(vcpe_service.bbs_server)
        else:
            logger.info("neither bbs_slice nor bbs_server is configured in the vCPE")

        vlan_ids = []
        s_tags = []
        c_tags = []
        if o.volt:
            vlan_ids.append(o.volt.vlan_id)  # XXX remove this
            s_tags.append(o.volt.s_tag)
            c_tags.append(o.volt.c_tag)

        try:
            full_setup = Config().observer_full_setup
        except:
            full_setup = True

        safe_macs=[]
        if vcpe_service.url_filter_kind == "safebrowsing":
            if o.volt and o.volt.subscriber:
                for user in o.volt.subscriber.users:
                    level = user.get("level",None)
                    mac = user.get("mac",None)
                    if level in ["G", "PG"]:
                        if mac:
                            safe_macs.append(mac)

        wan_vm_ip=""
        wan_vm_mac=""
        tags = Tag.select_by_content_object(o.instance).filter(name="vm_wan_addr")
        if tags:
            parts=tags[0].value.split(",")
            if len(parts)!=3:
                raise Exception("vm_wan_addr tag is malformed: %s" % value)
            wan_vm_ip = parts[1]
            wan_vm_mac = parts[2]
        else:
            if CORD_USE_VTN:
                raise Exception("no vm_wan_addr tag for instance %s" % o.instance)

        fields = {"vlan_ids": vlan_ids,   # XXX remove this
                "s_tags": s_tags,
                "c_tags": c_tags,
                "dnsdemux_ip": dnsdemux_ip,
                "cdn_prefixes": cdn_prefixes,
                "bbs_addrs": bbs_addrs,
                "full_setup": full_setup,
                "isolation": o.instance.isolation,
                "wan_container_gateway_mac": vcpe_service.wan_container_gateway_mac,
                "wan_container_gateway_ip": vcpe_service.wan_container_gateway_ip,
                "wan_container_netbits": vcpe_service.wan_container_netbits,
                "wan_vm_mac": wan_vm_mac,
                "wan_vm_ip": wan_vm_ip,
                "safe_browsing_macs": safe_macs,
                "container_name": "vcpe-%s-%s" % (s_tags[0], c_tags[0]),
                "dns_servers": [x.strip() for x in vcpe_service.dns_servers.split(",")],
                "url_filter_kind": vcpe_service.url_filter_kind }

        # add in the sync_attributes that come from the SubscriberRoot object

        if o.volt and o.volt.subscriber and hasattr(o.volt.subscriber, "sync_attributes"):
            for attribute_name in o.volt.subscriber.sync_attributes:
                fields[attribute_name] = getattr(o.volt.subscriber, attribute_name)

        return fields

    def sync_fields(self, o, fields):
        # the super causes the playbook to be run

        super(SyncVSGTenant, self).sync_fields(o, fields)

        # now do all of our broadbandshield stuff...

        service = self.get_vcpe_service(o)
        if not service:
            # Ansible uses the service's keypair in order to SSH into the
            # instance. It would be bad if the slice had no service.

            raise Exception("Slice %s is not associated with a service" % instance.slice.name)

        # Make sure the slice is configured properly
        if (service != o.instance.slice.service):
            raise Exception("Slice %s is associated with some service that is not %s" % (str(instance.slice), str(service)))

        # only enable filtering if we have a subscriber object (see below)
        url_filter_enable = False

        # for attributes that come from CordSubscriberRoot
        if o.volt and o.volt.subscriber:
            url_filter_enable = o.volt.subscriber.url_filter_enable
            url_filter_level = o.volt.subscriber.url_filter_level
            url_filter_users = o.volt.subscriber.users

        if service.url_filter_kind == "broadbandshield":
            # disable url_filter if there are no bbs_addrs
            if url_filter_enable and (not fields.get("bbs_addrs",[])):
                logger.info("disabling url_filter because there are no bbs_addrs")
                url_filter_enable = False

            if url_filter_enable:
                bbs_hostname = None
                if service.bbs_api_hostname and service.bbs_api_port:
                    bbs_hostname = service.bbs_api_hostname
                else:
                    # TODO: extract from slice
                    bbs_hostname = "cordcompute01.onlab.us"

                if service.bbs_api_port:
                    bbs_port = service.bbs_api_port
                else:
                    bbs_port = 8018

                if not bbs_hostname:
                    logger.info("broadbandshield is not configured")
                else:
                    tStart = time.time()
                    bbs = BBS(o.bbs_account, "123", bbs_hostname, bbs_port)
                    bbs.sync(url_filter_level, url_filter_users)

                    if o.hpc_client_ip:
                        logger.info("associate account %s with ip %s" % (o.bbs_account, o.hpc_client_ip))
                        bbs.associate(o.hpc_client_ip)
                    else:
                        logger.info("no hpc_client_ip to associate")

                    logger.info("bbs update time %d" % int(time.time()-tStart))


    def run_playbook(self, o, fields):
        ansible_hash = hashlib.md5(repr(sorted(fields.items()))).hexdigest()
        quick_update = (o.last_ansible_hash == ansible_hash)

        if ENABLE_QUICK_UPDATE and quick_update:
            logger.info("quick_update triggered; skipping ansible recipe")
        else:
            if o.instance.isolation in ["container", "container_vm"]:
                super(SyncVSGTenant, self).run_playbook(o, fields, "sync_vcpetenant_new.yaml")
            else:
                if CORD_USE_VTN:
                    super(SyncVSGTenant, self).run_playbook(o, fields, template_name="sync_vcpetenant_vtn.yaml")
                else:
                    super(SyncVSGTenant, self).run_playbook(o, fields)

        o.last_ansible_hash = ansible_hash

    def delete_record(self, m):
        pass